Pore-size control in porous SiC ceramics prepared by spark plasma sintering

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  • HOTTA Mikinori
    Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • KITA Hideki
    Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • MATSUURA Hiroyuki
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University
  • ENOMOTO Naoya
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University
  • HOJO Junichi
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University

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Porous SiC ceramics were prepared at 1900–2000°C without holding time at 50–200°C/min under a pressure of 15 MPa in Ar with Al2O3, Y2O3, and AlN additives by spark plasma sintering. The effects of heating rate, heating temperature, and sintering additive on the porosity, pore size, microstructure, and flexural strength of the porous SiC ceramics were investigated. As the heating rate increased, the size of SiC grains in the samples decreased, the porosity increased, and the flexural strength decreased. The strength of the samples increased with an increase in heating temperature. The growth of SiC grains was suppressed in the sample prepared at 1950°C, and the sample had both high porosity (42%) and high strength (95 MPa). In the samples prepared with AlN–Y2O3 and AlN–Al2O3 additives at 1950°C the porosities were 32–39%. The addition of AlN to Y2O3 and Al2O3 additives resulted in the inhibition of grain growth and a decrease in the pore size of the samples. The maximum strength was 167 MPa in the prepared porous SiC ceramics.

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